For your practice to be uniquely tai chi, it must address the Tai Chi Classics, 13 postures, jing, 4 ounces of pressure, softness and yielding.
If it does not, you are not learning tai chi.
These aspects represent the centre of the training - the what of tai chi.Neigong is the how.

Once these components exist, there are many different ways you can implement them.
Every style and school of tai chi has its own approach.
Providing the Master follows the key principles, this diversity is healthy and natural.
No one is right and no one is wrong - just different.